Miner&#39;s electric lamp



T. STRETTON AND1. w. JONES.

MINER'S ELEcTRxc LAMP.

APPLICATION FILED AUGJ, 1919.

Patented sept. '14,. 1920. I

by (a. s.

UNITED STATES PATENT OFFICE- TEEODORE s'rEE'rTON, OE oAnnrrE,` WALES, ANDJOHNWILLIAN JONEs, OE CAN'NOOK, ENGLAND, AssIGNons TO'HAsLAMa sTRET'roN LIMITED, OE CAEDIFE, WALES.

MINERS ELECTRIC LAMP.

Specification of Letters Patent.

Application mea August 11, 1919. seriai No. 316,793.-

To all whom t may concern.' A f y p Be it known that we,v THEoDonE STRETTON and JOHN WILLIAM JoNEs, subjects'of the King of Great Britain and Ireland, residing, respectively, -at 1l `Vindsor Place, Cardiff, lVales, and Wave Crest, Blackfords, Cannock, Staffordshire, England, have in-k vented certain new and useful improvements Relating to Miners Electric Lamps, of, which the following is arspecication.`

This invention `relates yto miners safety electric lampsy of the kind in which the cas,-

ving carrying the cell is detachable from the top part carrying the incandescent lamp.`

,According to the invention ,simple and effective means are provided forffmounting the, lamp so as -to avoid shocks being im'- parted to it and simple and effective means are pro-vided for mounting they well glass cover'in position and for'also mounting the contact plate in position in thelower part of the lamp top.

The invention comprises the features which are hereinafter described. y o Thefinvention is illustrated in the accompanying drawing in which ,Figure 1 is a sectional elevation of a lamp constructed according to the invention, while t -Fig 2 is an underr thereto. 1 I

Fig. 3 is a detail sectional view'. In the drawings the lower lpart of the lamp being the container for the battery is not illustrated.l This and the battery may take the form described in the specification of a co-pendngfapplication i l 'In carrying the .invention into effect as illustrated in the accompanying drawings, theI electric lamp is fitted within a socket a which is mounted between two counteracting springs one ofwhich b is applied between the socket a and the underside ofk a cap or socket inclosure c disposedbeneath and supporting the bulb d of the lamp, and the other b1 between the endofthe lamp plug 'i and the contact plate `ek beneath it, so that thus the lamp and filament 'may withstand shock, to which the lamp itself may be subjected, without beingl broken. For this purpose the cap or socket' inclosure plan corresponding c may extend upwardly into the centraly cavity or well in the glass cover f and at its lower end the cap' or socket inclosure c may be provided wit.. an outwardly extends Patent-ea sept. 14, `1920.

ing flange c1. The cap or socket inclosure c is connected with the negative contact it upon the contact plate e. The plug i of the lamp hasa plain. cylindrical surface at the 4part adjoiningv the bulbd, while its lowerv the other end of the spiral springbis sweated to the lower end of the socket o, orv to anoutwardly extending fiange a1 provided at the lower end of the socket. It will be yunderstood that the cap or socket inclosure c itself may -be `of dome or other similar shape and that its externalface maybe coated with nickel or silver for use as a refiector. A hole is provided centrally at its upperv end through which the plain part of the lamp plug 2 passes, and Yin' which it freely slides under shock.` y

The contact plate e mounted beneath the lamp and socket has the positive contact m extended to a central position, and the second or contact spiral spring b1 extends from i this position to the lower end ofthe lamp plug z'. The second spring fbl'is thus dis- 1 posed beneath the lamp while the iirstsurrounds the socket a and plug i of the lamp.

The top part of the lamp casing n is provided as is usual for a pressed metal plate withan inwardly extending flange al at its upper end, which engages theoutwardly eX- tending flange f1 at the lower end of the well glass cover f, and at its lower vend the -top part of the lamp casing `is provided with known means for the reception and magnetic lock of the upper end of the cell casing whose terminals am are indicatedfin dotted lines.

The top part of the lamp casing n has secured within it a brass or other lining or cylinder 0, within which the outwardly extending fiange f1 of the well glass cover f l.is retained by means of a metal ring` p tact plate e may be removed without the necessary removal of the glass cover.

Rubber rings or washers 71 r1, may be interposed between the metal ring p and the underfaceof the glass cover f and between the top face of the outwardly extending flange fl of the glass cover', and the inwardly-extending flange nl at the upper end of the top part of the lamp casing.

It will be understood that the top part of the lamp casing oi may be connected by a number of rods s to a crown t surmounting the well glass cover f, to which crown a hook or loop u may be centrally connected for carrying the lamp. The well glass cover f thus extends between the top part of the lamp and the crown;

The well glass cover f may be provided on its outer top face at fu or on its inner top face` at fw with a reflecting surface, and its form may be modified for this purpose.

Ve claim:

1. An electric lamp comprising in combination an incandescent lamp, a socket within which the plug of the said lamp is fitted,

acap or socket inclosure within which the plug of the said lamp is freely mounted, a spiral spring surrounding the socket and connecting the socket to the upper end of the said cap orsocket inclosure, a contact plate beneath the saidcap or socket inclosure and the socket, a spring disposed between one of the contacts upon the said contact plate and the end of the lamp plug, and means for connecting the cap or socket inclosure to the other of the contacts upon the contact plate, substantially as described.

2. An electric lamp comprising in combination an incandescent lamp provided with a screw threaded plug, a socket within which the said screw threaded plug of the lamp is fitted, a cap or socket inclosure within which the plug of the said lamp is freely mounted, a spiral spring surrounding the socket and connecting the socket to the upper end of the said cap or socket inclosure, a contact plate beneath the said cap or socket inclosure and the socket, a spring disposed between one of the contacts upon the said contact plate and the end of the lamp plug, and means for connecting the cap or socket inclosure to the other of the contacts upon the contact plate, substantially as described.

3. An electric lamp comprising in combination anA incandescent lamp having the part of the plug adjoining the lamp of a plain cylindrical form, a socket within which the end of the said plug of the lamp is fitted, a cap or socket inclosure within which the plug of the said lamp is freely mounted, a spiral spring surrounding the socket and connecting the socket to the upper end of the said cap or socket inclosure,

a contact plate beneath the said cap orsocket inclosure and the socket, a spring disposed between one of the contacts upon the said contact plate and the end of the lamp plug, and means for connecting the cap or socket inclosure to the other of the contacts upon the contact plate, substantially as described.

4L. A miners electric lamp consisting in combination of the top part of the lamp caS- p ing, a well glass cover mounted therein and having at its lower end an outwardly `protruding flange engaged by an inwardly protruding flange at the lower end of the top part of the lamp casing, an incandescent lamp mounted within the said well glass cover, a fitting upon which the said incandescent lamp is mounted, a retaining ring screwed from below into the lower end of the top part of the lamp casing, a loosely fitting contact plate and asecond retaining ring for retaining the contactV plate beneath the lower end of the well glass cover, sub stantially as described.

5. A miners electric lamp, comprising in combination the top part of the lamp casing, a well glass cover mounted therein' and having an outwardly protruding flange at its lower end engaged by an inwardly protruding flange at the lower end of the top part of' the lamp casing, a liner within the lower end of the top part of the lamp casing, a retaining ring screwed into the said liner from beneath the lower part ofthe lamp casing to support the well glass cover from below, a loosely vfitting contact plate beneath the well glass vcover and a second retaining ring for retaining the said contact plate in position,rsubstantially as described. t

6. A miners electriclamp consisting in combination of an incandescent lamp, a socket within which the plug of the said lamp is fitted, a cap or socket inclosure within which the plug of the said lamp is freely mounted, a spiral spring surrounding the socket and connecting the socket to the upper end of the' cap or socket inclosure, a contact platebeneath the c ap or.socket inclosure and beneath the socket, a spring disposed between one of the contacts upon said contact plate kand the end of the lampv plug, means for connecting the cap or socket inclosure to the other of the contacts upon the said contact plate, a well glass cover -for the said incandescent lamp, a retaining ring for supporting the said well glass cover from below within the lower end of the top part voi the lamp casing, and a separate retaining ring for supporting the contact plate within the lower end of the top part of the lamp casing, substantially as described.

THEoDoRE sTRE'rroN. JoHN WILLIAM JONES. 

